#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
using namespace std;

class Solution {
public:
    int maxProfit(vector<int>& prices, int fee) {
        int dp[50005][2];
        dp[0][0] = 0;
        dp[0][1] = -prices[0];
        for(int i=1;i<prices.size();i++){
            dp[i][0] = max(dp[i-1][0],dp[i-1][1]+prices[i]-fee);
            dp[i][1] = max(dp[i-1][1],dp[i-1][0]-prices[i]);
        }
        return max(dp[prices.size()-1][0],dp[prices.size()-1][1]);
    }
};

